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Revenue Recognition - Contract Asset and Liability (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Contract Assets  
Contract Assets at December 31, 2020 $ 135,973
Additions 25,307
Transfers to Trade Receivables, Net (26,121)
Contract Assets at March 31, 2021 135,159
Contract Liabilities  
Contract Liabilities at December 31, 2020 11,339
Contract Liabilities at March 31, 2021 13,858
Other Current Liabilities  
Contract Liabilities  
Contract Liabilities at December 31, 2020 10,815
Additions 6,546
Revenue Recognized (3,650)
Contract Liabilities at March 31, 2021 $ 13,711